Trick questions involving Java methods...

MethodPractice.java

public class MethodPractice
{   
    public static int question1(int a, int b) {
        return a * b;
    }
    
    public static void question2(int a) {
        a = 2 * a;
    }
    
    public static void question3(int[] arr, int a) {
        a = 2 * a;
        arr[a] = 3;
    }
    
    public static void question4(String greeting) {
        greeting += "Sophia";
    }
    
    public static int question5(int[] arr) {
        int minElement = arr[0];
        for (int i = 1; i < arr.length; i++) {
            if (arr[i] < minElement) {
                minElement = arr[i];
            }
        }
        return minElement;
    }
    
    public static void question6(int[][] arr) {
        for (int r = 0; r < arr.length; r++) {
            for (int c = 0; c < arr[0].length; c++) {
                if (c == 1) {
                    arr[r][c] = 1;
                }
            }
        }
    }

    public static void question7(int[][] arr) {
        // Creating a new 2D array and pointing arr to that.
        arr = new int[][]{{10, 20, 30},
                          {40, 50, 60},
                          {70, 80, 90}};
    }
        
    public static void main(String[] args) {     
        // Okay here's a bunch of "what gets printed"
        // questions...
        //
        // I'm pretty sure there's going to be
        // "what gets printed" multiple-choice questions
        // on the AP, where they give you a bunch of possible
        // answers. So my questions are a wee-bit harder
        // because I'm asking you to come up with the
        // answer yourself rather than picking the right
        // one from a list of options. :)
        //
        // Try doing it by hand first and when
        // you've finished everything, then run this
        // program with BlueJ (copy and paste the code)
        // and check your answers.
        //
        // For the ones that you miss, try to figure out
        // why you got it wrong. And then explain to me
        // (on Sunday) what's really happening for those 
        // questions.
        //
        // Just so I can make sure you
        // actually understand :) 
        
        // Question 1:
        System.out.println("\n\nQuestion 1.");
        int a = 5;
        int b = 2;
        int result = question1(a + b, a + b);
        System.out.println(result);

        // Question 2:
        System.out.println("\n\nQuestion 2.");
        a = 3;
        question2(a);
        System.out.println(a);

        // Question 3:
        System.out.println("\n\nQuestion 3.");
        a = 1;
        int[] arr = {10, 20, 30, 40, 50};
        question3(arr, a);
        System.out.println(arr[a]);
        System.out.println(arr[2]);

        // Questin 4:
        System.out.println("\n\nQuestion 4.");
        String greeting = "Hi ";
        question4(greeting);
        System.out.println(greeting);

        // Question 5:
        System.out.println("\n\nQuestion 5.");
        arr = new int[]{10, 20, 30, 40, 50}; // This just creates a new array with the numbers.
        System.out.println(question5(arr));

        // Question 6:
        System.out.println("\n\nQuestion 6.");
        int[][] arr2 = {{1, 2, 3},
                        {4, 5, 6},
                        {7, 8, 9}};
        question6(arr2);
        print2DArray(arr2); // This just prints out the 2D array in square format.

        // Question 7:
        System.out.println("\n\nQuestion 7.");
        arr2 = new int[][]{{1, 2, 3},
                           {4, 5, 6},
                           {7, 8, 9}};
        question7(arr2);
        print2DArray(arr2);
    }

    /* Pretty-prints a 2D array of integers to the screen. */
    public static void print2DArray(int[][] arr) {
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr[i].length; j++) {
                System.out.print(arr[i][j] + "\t");
            }
            System.out.println();
        }
    }
}